How long does it take for a child to see?

When a baby comes into this world from its mother's womb, its organs are not yet fully developed and it faces problems such as low resistance and incomplete bones. The baby's vision, hearing, taste and other body reaction organs need to go through a slow growth and development stage, and many parents are very worried about this. So how long does it take for babies to be able to see?

How long does it take for babies to see?

1. How long does it take for babies to see?

Newborn babies can see things, but their vision is blurry. They can probably sense things that are 15 to 20 centimeters away, but not clearly. Your baby will react to light while still in your belly. You can take a flashlight that is not too strong, shine it on your belly from about 1-2 meters away, move slowly, and you will find that the fetus will move with the light. Therefore, newborns can see things as soon as they are born, but their eyes are less sensitive to things at this time, which makes it easy for people to mistakenly believe that newborns cannot see things.

Babies are born with vision, but newborns have very poor vision. Newborn babies have a sense of light, which is manifested by closing their eyes when stimulated by strong light. It also reacts to changes in light. When bright light shines on the eyes, the pupils become smaller. This is the so-called light reaction.

2. Reasons for babies’ insensitive vision

Newborns have just come from a dark world to a bright world, and their ability to adjust visual focus is poor in the early stages. If objects are too far, too close, too small, or move too fast, the baby cannot capture them well. Studies have shown that a newborn baby's field of vision is only about 45 degrees, and can only follow people or objects within 18-38 cm in front of it. Powered retinoscope testing found that the optimal visual focal length for newborns is 19 cm. Because they don't understand the vision characteristics of newborns, adults are always accustomed to using adult standards to judge whether babies can see things, and naturally think that newborns cannot see things.

3. How to test baby's vision

Do not put the instrument into the baby's eyes. Instead, shine a flashlight into the eyes to check the vision. The vision of infants and young children is judged by observing the degree of vibration of their eyeballs. Using special examination instruments, such as a retina mirror or a handheld computer ophthalmometer, can correctly judge the condition even if the infant or young child does not cooperate or moves during the examination. Visual evoked potentials, selective viewing method. This requires the cooperation of more advanced instruments. The cover method can be used to check strabismus. When the infant is looking at something, the doctor covers one of the infant's eyes with his hand and observes his reaction. If the child has no obvious reaction, it means that the vision in this eye is low.

The development of infant vision

1. Newborns under 1 month old prefer to look at objects with complex shapes and bright colors, and their vision is 1/30 of that of adults;

2. Babies aged 1-2 months have the ability to gaze and fixate. They will look at the person holding them, but they cannot look for too long.

3. A 3-month-old baby has a 180-degree field of vision. He can see his own hands, feel his own existence, and recognize people. The saying "three months to recognize the mother" refers to babies at this stage.

4. The retina of babies aged 4-6 months is well developed and they can see both near and far objects alternately. At this time, the baby's vision is about 0.1;

After 5 or 6 months, the baby's eyes can focus and the visual acuity remains between 0.1-0.2.

6. At the age of 2, the baby's vision can reach about 0.4, and he can judge the distance of objects. His vision can also keep up with fast-moving objects and see them clearly.

7. At the age of 3, the visual acuity can reach above 0.6. The vision is relatively sharp, and the baby likes to observe. He can use his eyes to guide his hands to touch new things. The eye-hand coordination is more flexible, and the establishment of stereoscopic vision is almost complete.

What to eat for baby's eyesight

1. Foods containing vitamin A and carotene are good for the eyes. Because vitamin A is a necessary component for the secretion of mucous membrane cells, if the mucus secretion is insufficient, the eyes are prone to dryness, fatigue, congestion and other dry eye symptoms. Foods rich in vitamin A and carotene, such as: animal liver, egg yolk, milk and dairy products from animal sources, and yellow-green fruits and vegetables from plant sources (such as: broccoli, pumpkin, carrot, amaranth, spinach, leek, green pepper, sweet potato, papaya, mango, etc.).

2. Vitamin B is found in animal liver, milk, lean meat, green leafy vegetables, beans, wheat germ, brown rice, and brewer's yeast, which are rich in this type of vitality factor.

3. Dark green and yellow-red fruits and vegetables rich in vitamin C (such as green peppers, cucumbers, cauliflower, Chinese cabbage, fresh dates, guava, tomatoes, strawberries, kiwis, grapefruits, etc.).

4. DHA is also a component of the eyeball. Seaweed foods and deep-sea fish (such as salmon, tuna, etc.) are rich in DHA.